I ahev always practice to a drum machine although I have a metronone. I used to practice to an electronic metronome but the doik,doik,doik noise it made drove me nuts after like 10 minutes. So I got a drum machine and I can practice for longer preiods of time. but recently I was reading a bass instruction book and it said practising to a metronome is better because you can hear yourself play. And you will know it you are intime or not and with the drum machinwe yor playing is hidden undee the drums. So it got me thinking what should I practice to. What do you practice to?